Stationery item? Penelope quietly removed about five (8)

I believe the answer is:

envelope

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'stationery item?' is the definition.
'envelope' can be an answer for 'item?' (I have seen 'Item of mail' mean 'envelope' so perhaps 'item' could also mean 'envelope'). I am not certain of the 'stationery' bit.

'penelope quietly removed about five' is the wordplay.
'quietly' becomes 'p' (musical symbol).
'removed' suggests deleting specific letters.
'about' means one lot of letters goes inside another.
'five' becomes 'V' (Roman numeral).
'penelope' with 'p' taken out is 'enelope'.
'enelope' placed around 'v' is 'ENVELOPE'.

Can you help me to learn more?

(Other definitions for envelope that I've seen before include "Mailing item" , "Sheath, wrapping" , "Wrapper for 31ac" , "Container for papers" , "Maximum operational capability" .)

I've seen this clue in The Telegraph.

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